Google Maps API Reference——Google 地图 API 文档之七-3
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class GPolyline
This is a map overlay that draws a polyline on the map, using the vector drawing facilities of the browser if they are available, or an image overlay from Google servers otherwise.
Constructor
color is given as a string that contains the color in hexadecimal numeric HTML style, i.e. #RRGGBB. The weight is the width of the line in pixels. The opacity is given as a number between 0 and 1. The line will be antialiased and semitransparent. Factory Methods
color is a string that contains a hexadecimal numeric HTML style, i.e. #RRGGBB. weight is the width of the line in pixels. opacity is a number between 0 and 1. points is a string containing the encoded latitude and longitude coordinates. levels is a string containing the encoded polyline zoom level groups. numLevels is the number of zoom levels contained in the encoded levels string. zoomFactor is the magnification between adjacent sets of zoom levels in the encoded levels string. Together, these two values determine the precision of the levels within an encoded polyline. The line will be antialiased and semitransparent. (Since 2.63) Methods
GPolyline.supportsHide() returns true. Note that this function triggers the event GPolyline.visibilitychanged in case the polyline is currently visible. (Since 2.87) isHidden() Boolean Returns true if the polyline is currently hidden. Otherwise returns false. (Since 2.87) show() none Shows the polyline if it is currently hidden. Note that this function triggers the event GPolyline.visibilitychanged in case the polyline is currently hidden. (Since 2.87) supportsHide() Boolean Returns true if GPolyline.hide() is supported in the current environment for GPolyline objects. Otherwise returns false. (Since 2.87) Events
GMap2.removeOverlay() or GMap2.clearOverlays(). visibilitychanged isVisible This event is fired when the visibility state of the polyline toggles from visible to hidden or vice versa. The isVisible argument reflects the state of the polyline after completion of this visibility state. (Since 2.87) click latlng This event is fired when the polyline is clicked. Note that this event also subsequently triggers a "click" event on the map, where the polyline is passed as the overlay argument within that event. (Since 2.88) class GPolylineOptions
Instances of this class are used in GPolyline's constructor. There is no constructor for this class. Instead, this class is instantiated as a javascript object literal.
Properties
As the name of this class indicates, all properties are optional.
true, i.e. if the option is not specified, the polyline will be clickable. (Since 2.91) geodesic Boolean Render each edge of the polyline as a geodesic (a segment of a "great circle"). A geodesic is the shortest path between two points along the surface of the Earth. (Since 2.84) class GPolygon
This is very similar to a GPolyline, except that you can additionally specify a fill color and opacity.
Constructor
colors are given as a string that contains the color in hexadecimal numeric HTML style, i.e. #RRGGBB. The weight is the width of the line in pixels. The opacities is given as a number between 0 and 1. The line will be antialiased and semitransparent. (Since 2.69) Factory Methods
polylines contains an associative array of constituent polylines, encoded in the same format as described in the GPolyline.fromEncoded documentation. fill specifies whether to fill in the polygon with a certain color. opacity and outline specifies whether to stroke the polygon with the polyline's color, weight and opacity. In case multiple values are specified in polylines, the first polyline's values are taken. (Since 2.78) Methods
GPolygon.supportsHide returns true. Note that this function triggers the event GPolygon.visibilitychanged in case the polygon is currently visible. (Since 2.87) isHidden() Boolean Returns true if the polygon is currently hidden. Otherwise returns false. (Since 2.87) show() none Shows the polygon if it is currently hidden. Note that this function triggers the event GPolygon.visibilitychanged in case the polygon is currently hidden. (Since 2.87) supportsHide() Boolean Returns true if GPolygon.hide() is supported in the current environment for GPolygon objects. Otherwise returns false. (Since 2.87) Events
GMap2.removeOverlay() or GMap2.clearOverlays(). visibilitychanged isVisible This event is fired when the visibility state of the polygon toggles from visible to hidden or vice versa. The isVisible argument reflects the state of the polygon after completion of this visibility state. (Since 2.87) click latlng This event is fired when the polygon is clicked. Note that this event also subsequently triggers a "click" event on the map, where the polygon is passed as the overlay argument within that event. (Since 2.88>) class GPolygonOptions
Instances of this class are used in GPolygon's constructor. There is no constructor for this class. Instead, this class is instantiated as a javascript object literal.
Properties
As the name of this class indicates, all properties are optional.
true, i.e. if the option is not specified, the polygon will be clickable. (Since 2.91) class GGroundOverlay
This object creates a rectangular image overlay on the map, whose boundaries are defined by GLatLngBounds.
Constructor
Methods
GGroundOverlay.visibilitychanged in case the ground overlay is currently visible. (Since 2.87) isHidden() Boolean Returns true if the ground overlay is currently hidden. Otherwise returns false. (Since 2.87) show() none Shows the ground overlay if it is currently hidden. Note that this function triggers the event GGroundOverlay.visibilitychanged in case the ground overlay is currently hidden. (Since 2.87) supportsHide() Boolean Always returns true. (Since 2.87) Events
isVisible argument reflects the state of the ground overlay after completion of this visibility state. (Since 2.77) class GIcon
An icon specifies the images used to display a GMarker on the map. For browser compatibility reasons, specifying an icon is actually quite complex. Note that you can use the default Maps icon G_DEFAULT_ICON if you don't want to specify your own.
Constructor
copy argument, its properties are copied, otherwise they are left empty. The optional argument image sets the value of the image property. Constants
Properties
image. mozPrintImage String The URL of the foreground icon image used for printed maps in Firefox/Mozilla. It must be the same size as the main icon image given by image. printShadow String The URL of the shadow image used for printed maps. It should be a GIF image since most browsers cannot print PNG images. transparent String The URL of a virtually transparent version of the foreground icon image used to capture click events in Internet Explorer. This image should be a 24-bit PNG version of the main icon image with 1% opacity, but the same shape and size as the main icon. imageMap Array of Number An array of integers representing the x/y coordinates of the image map we should use to specify the clickable part of the icon image in browsers other than Internet Explorer. maxHeight Integer Specifies the distance in pixels in which a marker will visually "rise" vertically when dragged. (Since 2.79) dragCrossImage String Specifies the cross image URL when an icon is dragged. (Since 2.79) dragCrossSize GSize Specifies the pixel size of the cross image when an icon is dragged. (Since 2.79) dragCrossAnchor GPoint Specifies the pixel coordinate offsets (relative to the iconAnchor) of the cross image when an icon is dragged. (Since 2.79) class GPoint
A GPoint represents a point on the map by its pixel coordinates. Notice that in v2, it doesn't represent a point on the earth by its geographical coordinates anymore. Geographical coordinates are now represented by GLatLng.
In the map coordinate system, the x coordinate increases to the left, and the y coordinate increases downwards.
Notice that while the two parameters of a GPoint are accessible as properties x and y, it is better to never modify them, but to create a new object with different paramaters instead.
Constructor
GPoint object. Properties
x coordinate, increases to the left. y Number y coordinate, increases downwards. Methods
true iff the other point has equal coordinates. toString() String Returns a string that contains the x and y coordinates, in this order, separated by a comma. class GSize
A GSize is the size in pixels of a rectangular area of the map. The size object has two parameters, width and height. Width is a difference in the x-coordinate; height is a difference in the y-coordinate, of points.
Notice that while the two parameters of a GSize are accessible as properties width and height, it is better to never modify them, but to create a new object with different paramaters instead.
Constructor
GSize object. Properties
Methods
true iff the other size has exactly equal components. toString() String Returns a string that contains the wdith and height parameter, in this order, separated by a comma. class GBounds
GBounds is a rectangular area of the map in pixel coordinates. Notice that a rectangle in geographical coordinates is represented by a GLatLngBounds object.
Constructor
points. Properties
Methods
true if the passed rectangular area is entirely contained in this rectangular area. containsPoint(point) Boolean Returns true if the rectangular area (inclusively) contains the pixel coordinates. (Since 2.88) extend(point) none Enlarges this box so that the point is also contained in this box. class GLatLng
GLatLng is a point in geographical coordinates longitude and latitude.
Notice that although usual map projections associate longitude with the x-coordinate of the map, and latitude with the y-coordinate, the latitude cooridnate is always written first, followed by the longitude, as it is custom in cartography.
Notice also that you cannot modify the coordinates of a GLatLng. If you want to compute another point, you have to create a new one.
Constructor
unbounded flag is true, then the numbers will be used as passed, otherwise latitude will be clamped to lie between -90 degrees and +90 degrees, and longitude will be wrapped to lie between -180 degrees and +180 degrees. Methods
unbounded flag was set in the constructor, this coordinate can be outside this interval. lng() Number Returns the longitude coordinate in degrees, as a number between -180 and +180. If the unbounded flag was set in the constructor, this coordinate can be outside this interval. latRadians() Number Returns the latitude coordinate in radians, as a number between -PI/2 and +PI/2. If the unbounded flag was set in the constructor, this coordinate can be outside this interval. lngRadians() Number Returns the longitude coordinate in radians, as a number between -PI and +PI. If the unbounded flag was set in the constructor, this coordinate can be outside this interval. equals(other) Boolean Returns true iff the other size has equal components, within certain roundoff margins. distanceFrom(other) Number Returns the distance, in meters, from this point to the given point. The earth is approximated as a sphere, hence the distance could be off by as much as 0.3%. See below. (Deprecated since 2.89) distanceFrom(other, radius?) Number Returns the distance, in meters, from this point to the given point. By default, this distance is calculated given the default equatorial earth radius of 6378137 meters. The earth is approximated as a sphere, hence the distance could be off as much as 0.3%, especially in the polar extremes. You may also pass an optional radius argument to calculate distances between GLatLng coordinates on spheres of a different radius than earth. (Since 2.89) toUrlValue() String This version of the method has been deprecated in favor of the revised version (shown below) which passes an optional precision parameter. (Deprecated since 2.78) toUrlValue(precision?) String Returns a string that represents this point in a format suitable for use as a URL parameter value, separated by a comma, without whitespace. By default, precision is returned to 6 digits, which corresponds to a resolution to 4 inches/ 11 centimeters. An optional precision parameter allows you to specify a lower precision to reduce server load. Note: prior to 2.78, this precision parameter was not available. (Since 2.78) Properties
These properties exist for backwards compatibility with v1 event handler functions only. They should not be used.
These properties mirror the return values of the lng() and lat() accessor methods and they allow a GLatLng to appear in places where a GPoint is expected by a v1 client. This is necessary where GLatLng appears in event details (i.e. in arguments of event handler functions). In contrast to method wrappers, it is impossible in the current infrastructure to create event wrappers.
class GLatLngBounds
A GLatLngBounds instance represents a rectangle in geographical coordinates, including one that crosses the 180 degrees meridian.
Constructor
Methods
true iff all parameters in this rectangle are equal to the parameters of the other, within a certain roundoff margin. contains(latlng) Boolean Returns true iff the geographical coordinates of the point lie within this rectangle. (Deprecated since 2.88) containsLatLng(latlng) Boolean Returns true iff the geographical coordinates of the point lie within this rectangle. (Since 2.88) intersects(other) Boolean What the name says. containsBounds(other) Boolean What the name says. extend(latlng) none Enlarges this rectangle such that it contains the given point. In longitude direction, it is enlarged in the smaller of the two possible ways. If both are equal, it is enlarged at the eastern boundary. getSouthWest() GLatLng Returns the point at the south-west corner of the rectangle. getNorthEast() GLatLng Returns the point at the north-east corner of the rectangle. toSpan() GLatLng Returns a GLatLng whose cordinates represent the size of this rectangle. isFullLat() Boolean Returns true if this rectangle extends from the south pole to the north pole. isFullLng() Boolean Returns true if this rectangle extends fully around the earth in the longitude direction. isEmpty() Boolean Returns true if this rectangle is empty. getCenter() GLatLng Returns the point at the center of the rectangle. (Since 2.52) interface GControl
This interface is implemented by all controls. You can implement it in order to provide a custom control for the map. Controls are added to the map using the GMap2.addControl() method.
In contrast to overlays, which are positioned relative to the map, controls are positioned relative to the map view, i.e. they don't move when the map moves.
Constructor
printable indicates that the control should be visible in the print output of the map. Flag selectable indicates that the control will contain text that should be selectable. Methods
These methods will be called by the map when the control is added to the map using GMap2.addControl(). Thus, these methods will not be called by you, but they will be implemented by you.
GMap2.getContainer() to get hold of the DOM element that contains the map, and add itself to it. It returns the added element. getDefaultPosition() GControlPosition Returns to the map the position in the map view at which the control appears by default. This will be overridden by the second argument to GMap2.addControl(). class GControlPosition
This class described the position of a control in the map view. It consists of a corner relative to where the control is postioned, and an offset that determines this position. It can be passed as optional argument position to the method GMap2.addControl(), and it is returned from method GControl.getDefaultPosition().
Constructor
enum GControlAnchor
Constants
class GControl
These implementations of interface GControl are available.
Constructor
GOverviewMapControl creates an overview map with a one-pixel black border. class GMapType
Google provides some predefined map types - this class is used to define custom ones. In order to show them on the map, use the GMap2 constructor, or the GMap2.addMapType() method. See also GTileLayerOverlay to add to (rather than entirely replace) the map's tile layers.
This class can also be subclassed. Constructor arguments can be omitted if instantiated as a prototype. A subclass constructor must invoke the GMapType constructor using call().
Constructor
Methods
These methods are mostly called by the map that this maptype is passed to, but some methods may also be called from outside the map, e.g. getBoundsZoomLevel().
GMapTypeControl. getProjection() GProjection Returns to the map the projection of this map type. getTileSize() Number Returns to the map the map tile size in pixels of this map type. The tiles are assumed to be quadratic. All tile layers have the same tile size. getTileLayers() Array of GTileLayer Returns to the map the array of tile layers. getMinimumResolution() Number Returns to the map the lowest zoom level at which this map type is defined. getMaximumResolution() Number Returns to the map the highest zoom level at which this map type is defined. getTextColor() String Returns to the map the color that is best used for text that is overlaid on the map. Used for the color of the text of the copyright message displayed by the copyroght control. getLinkColor() String Returns to the map the color that is best used for a hyperlink that is overlaid on the map. Used for the color of the link to the terms of use displayed by the copyroght control. getErrorMessage() String Returns to the map the error message that is displayed in areas or on zoom level where this map type doesn't have map tiles. getCopyrights(bounds, zoom) Array of String Returns to the map the copyright messages appropriate for the region described by bounds at the given zoom level. This is used by the copyright message on the map. getUrlArg() String Returns to the map a value that is used as a URL paramater value to identify this map type in permalinks to the current map view. This is currently only used by the maps application. getAlt() String Returns to the map the alternative text of this map type. (Since 2.86) Constants
Events
class GMapTypeOptions
Instances of this class are used as the opts? argument to the GMapType constructor. There is no constructor for this class. Instead, this class is instantiated as a javascript object literal.
Properties
GMapType.getName(true). Default is the same as the name. urlArg String Sets the url argument of the map type that is returned from GMapType.getUrlArg(). Default is the empty string. maxResolution Number Sets the maximum zoom level of this map type, returned by GMapType.getMaximumResolution(). Default is the maximum of all tile layers. minResolution Number Sets the minimum zoom level of this map type, returned by GMapType.getMinimumResolution(). Default is the minimum of all tile layers. tileSize Number Set the tile size returned by GMapType.getTileSize(). Default is 256. textColor String Sets the text color returned by GMapType.getTextColor(). Default is "black". linkColor String Sets the text color returned by GMapType.getLinkColor(). Default is "#7777cc". errorMessage String Sets the error message returned by GMapType.getErrorMessage(). Default is the empty string. alt String Sets the alternative text to the map type returned by GMapType.getAlt(). Default is the empty string. (Since 2.64) radius Number Sets the radius of the map type given the passed Number measured in meters. The default value is 6378137, the equatorial radius of the Earth in meters. (Since 2.89)
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